Puerto Vallarta's climate is typical Tropical wet and dry
(Köppen climate classification Aw), with a marked dry season
in the winter. The high temperature and variations in
humidity can make July through September nearly intolerable.
It has pronounced wet and dry seasonal variation, with
sudden monsoon-like rains from July through September,
normally for a few hours in the evenings.

The average
daily high temperature is 86 °F (30 °C); average daily low
temperature is 70 °F (21 °C); average daily humidity is 75%.
The rainy season extends from mid June through mid October,
with most of the rain between July and September. August is
the city's wettest month, with an average of 14 days with
significant precipitation. Even during the rainy season
precipitation tends to be concentrated in large rainstorms.
Occasional tropical storms will bring thunderstorms to the
city in November, though the month is typically dry.
February, March and April are the months with the least
cloud cover.

Prevailing winds
are from the southwest, and most weather systems approaching
Puerto Vallarta are consequently weakened as they pass over
Cabo Corriente. Thus even during the rainy season Puerto
Vallarta's weather tends to be mild compared to other areas
along the Mexican Pacific coast.

Hurricanes
seldom strike Puerto Vallarta. In 2002 Hurricane Kenna, a
category 5 hurricane, made landfall about 100 miles (160 km)
northwest of Puerto Vallarta, and the city suffered some
damage from the resulting storm surge. In 1971 Hurricane
Lily, a category 1 hurricane, caused serious flooding on the
Isla Cuale, prompting the city to relocate all of its
residents to the new Colonia Palo Seco.